Bug#315774: grub not safe for compiler optimization

[Tormod Volden]

Package: grub
Version: 0.97-29
Followup-For: Bug #315774

I ran into the same segfaults when I compiled grub using gcc 4.1. It 
turned out the handling (pointer arithmetics) of variable arguments in 
char_io.c goes bad due to optimization. I replaced it with va_arg macros 
and the segfaults went away.
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